Thiazoles

ABSTRACT

Certain novel amides of at least three carbon atoms, which are substituted on the nitrogen by a thiazol-2-yl moiety, useful as herbicides.

United States Patent 1 [111 3,717,651

Pilgram et al. 51 Feb. 20, 1973 THIAZOLES [56] References Cited [75] Inventors: Kurt ll. Pilgram; Richard-D. Skiles, FOREIGN PATENTS OR APPLICATIONS 0f Modesto, Calif- 851,564 /1960 Great Britain ..260/306.8

[73] Assignee: Shell Oil Company, New York, N.Y.

Primary Examiner-Alex Maze] Flledl April 1970 Assistant Examiner-41. J Galla'gher 211 App] NOJ 3 7 AtmmeyFrank R. LaFontaine and Marion W.

' Western [52] US. Cl. ..260/3 06.!B R, 71/90 [57] ABSTRACT 55;} E33;e;5335.1:J::JJJJJJJJJ:.1'::.':.'::.'::Jf323,;3?; Certain m1 amides of at least me which are substituted on the nitrogen by a thiazol-Z-yl moiety, useful as herbicides.

3 Claims, No Drawings THIAZOLES BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a novel class of herbicidal amides containing at least three carbon atoms, and which are substituted on the nitrogen by'a thiazol-2-yl moiety substituted at the 5-position by a sulfur-containing moiety.

2. Description of Prior Art 7 N-(thiazol-2-yl)acetamides are known. Japanese Patent 1649 8/63 discloses Z-acetamido-S-alkylthiothi'azoles which are useful as fungicides. Other substituted Z-acetamido derivatives of 5-alkylthio or alkylsulfonyl thiazol'es have found utility as bactericides (J. Pharm. Soc. Japan 72, ll24-8[l952]), and as intermediates in dye production (J. Org. Chem. 24, 187- 96[1959 and British Patent 851,564).

SUMMARY OF THE INVENTION It has now been found that amides of greater carbon content than acetamide, substituted on the nitrogen by a thiazol-2-yl moiety substituted at the 5-position of the ring by a mercapto, sulfinyl, sulfonyl or sulfamoyl moiety, and optionally substituted in the 4-position with an alkyl group, are outstanding herbicides, giving effective control of several economically important weed species.

The invention accordingly is a new class of amides of greater carbon content than acetamide, substituted on the nitrogen by a thiazol-2-yl moiety substituted at the 5-position of the ring by a mercapto, sulfinyl, sulfonyl or sulfamoyl moiety and optionally substituted in the 4- 7 position with an alkyl group, their use as herbicides and herbicidal formulations containing them.

DESCRIPTION OF THE PREFERRED EMBODIMENT The novel compounds of this invention can be described by the general formula:

TN 1 \sl r" wherein R represents hydrogen or alkyl of up to 4 carcyclic alkyl of up to four carbon atoms or wherein R represents hydrogen, alkyl of up to four carbon atoms or cyclic alkyl of up to 4 carbon atoms; R is any of the moieties represented by R or a lower alkali metal ion (Na, K or Li) or R C(O wherein R is alkyl or up to three carbon atoms; R also represents alkoxy of up to three carbon atoms or wherein R and R are hydrogen or alkyl or up to three 'carbon atoms when R is hydrogen or alkyl of up to three carbon atoms; R and R together also may form an alkylene group. Any of these 6-'groups may be of either branched-chain or straight-chain configuration.

Exemplary species of the class of the invention include:

N-(4-methyl-5-(dimethylsulfamoyl)thiazol-2- yl)cyclopropanecarboxamide, N(5-(dimethylsulfamoyl)thiazol-2- yl)cyclopropanecarboxamide, N-(4-methyl-5-(dimethylsulfamoyl)thiazol-2- yl)propionamide, N-(5-(dimethysulfamoyl)thiazol-2-yl)propionamide, N-(S-(dimethylsulfamoyl)thiazol-Z- yl)cyclopropanecarboxamide, N-(5-(methylsulfamoyl)thiazol-2- yl)cyclopropanecarboxamide, N-(5-(methylsulfamoyl)thiazol-2yl )propionamide, Sodium salt of N-(5-(methylsulfamoyl)thiazol2 yl)cyclopropanecarboxamide, Sodium salt of N-(S-(methylsulfamoyl)thiazol-Z- yl)propionamide, Potassium salt of N-(S-(methylsulfamoyl)thiazol-2- yl)cyclopropanecarboxamide, Potassium salt of N-(S-(methylsulfamoyl)thiazol-2-.

yl)propionamide, N-(S-(aziridinylsulfonyl)thiazol- 2Y1)cyclopropanecarboxamide,

N-(S-(methylthio)thiazol-2-yl)-2-methylacrylamide,

N-(5-(methylsulfinyl)thiazol-2-yl)-2-methylacrylamide, N-(S-(methylsulfonyl)thiazol-2-yl)-2methylacrylamide, N-(S-(methylthio)thiazol-2-yl)-3,3-

bis(trifluoromethyl)acrylamide, N-(S-methylthio)thiazol-2-yl)-2-cyanocyclopropanecarboxamide, N-(5-(methylthio)thiazol-2-yl)cyclopentanecarboxyamide, N-(5-(methylsulfonyl)thiazol-Z-yl)cyclopentanecarboxamide, N-(S-methylthio)thiazol-2-yl) 3,4-dichlorobenzamide, N-(S-(methylsulfonyl)thizol-2-yl)-3,4-

dichlorobenzamide, N-(5-(methylsulfonyl)thiazol-2-yl)octanamide, N-(5-(methylsulfonyl)thiazol-2-yl)-2,2-dimethylpentamide, N-(5-(methylthio)thiazol-2-yl)-3-methyl-5,5-

dimethylhexanamide The highest herbicidal activity appears to be associated with the subclass wherein R represents hydrogen or alkyl, R is alkyl or cyclic alkyl, R is hydrogen or methyl, R is alkyl, cyclic alkyl or wherein R and R represent hydrogen or alkyl of up to three carbon atoms, n is 0, l or 2. Preferred species of this subclass include compounds wherein R and R represent hydrogen or methyl, R is alkyl of two to five carbon atoms or cyclic alkyl of up to four carbon atoms, R is alkyl of up to three carbon atoms.

Specific examples of the preferred subclass include: N-S-(methylthio)thiazol-2-yl)propionamide, N-(5-(methylsulfonyl)thiazol-Z-yl)propionamide, N-(4-methyl-5-(methylthio)thiazol-2-.yl)propionamide, N-(4-methyl-S-(methylsulfonyl)thiazol-2- yl)propionamide, N-(S(ethylthio)thiazol-Zyl)propionamide, N-(5-(ethylsulfonyl)thiazol-Z-yl)propionamide, N-(S-(isopropylsulfbnyl)thiazol-2-yl)propionamide, N-(S-(isopropylthio )thiazol-Z-yl)propionamide, N-(5-(isopropylsulfonyl)thiazole-Z-yl)propionamide, N-(5-(methylthio)thiazol-Z-yl)-2-methylpropionamide,

N-(5-(methylsulfonyl)thiazol-2-yl)-2-methylprionamid'e, N-(S-(methylthio)thiazol-Z-yl)cyclopropanecarboxamide,

N-(S-(rnethylsulfonyl)thiazol-2 yl)cyclopropanecarboxamide,

N-(S-(methylsulfinyl)thiazol-Z-yl)cyclopropanecarboxamide, Y

N-(4-methyl-5-(methylthio)thiazol-2- yl)cyclopropanecarboxamide, N-(4-methyl-5-(methylsulfonyl)thiazol-2- yl)cyclopropanecarboxamide, N-( 5-(methylthio)thiazol-2-yl 1 -methylcyclopropanecarboxamide, N-( 5 methylsulfonyl )thiazol-2-yl)- 1 -m ethylcyclopropanecarboxamide, N-(5-(ethylthio)thiazol-Z-yl)cyclopropanecarboxamide, N-(S-(ethylsulfonyl)thiazol-2-yl)cyclopropanecarboxamide, N-( 5 -(isopropylthio)thiazol-Z-yl)cyclopropanecarboxamide, N-(5-(isopropylsulfonyl)thiazol-Z- yl)cyclopropanecarboxamide, N-(5 (methylthio)thizol-2-yl)-2,Z-dimethylpropionamide, N-(S-(methylsulfonyl)thiazol-2-yl)-2,2-dimethylpropionamide, N-( 5-( methylthio )thiazol-Z-yl )cyclobutanecarboxamide, N-(5-(methylthio)thiazol-2-yl)-2-methylpentanamide, N-(5-(ethylthio)thiazol-Z-yl)-2-methylpentanamide, N-( 5 isopropylthio )thiazol-Z-yl )-2-m ethylpentanamide, N-(5-(methylsulfonyl)thiazol-Z-yl)-2-methylpentanamide, N-(S-(ethylsulfonyl)thiazol-Z-yl)-2-methylpen'tanamide,

' N-methyl-N-(4-methyl-5-(methylsulfonyDthiazol-Z- yl)cyclopropanecarboxamide,

N-methyl-N-(4-methyl5-(methylthio)thiazol-2- yl)cyclopropanecarboxamide,

N-methyl-N-(4-methyl-5-(methylthio)thiazol-2- yl)propionamide,

N-methyl-N-(4-methyl-5-(methylsulfonyl)thiazol-2- yl)propionamide,

N-(4-methyl-5-(ethylthio)thiazol-Z- yl)cyclopropanecarboxamide,

N-(4-methyl-5-(ethylsulfonyl)thiazol-2- yl )cyclopropanecarboxamide,

The compounds of this invention are solid at ambient temperature. They may be suitably formulated for use as herbicides, as wettable powders, 'dusts, granules, solutions, emulsifiable concentrates, emulsions and pastes. Wettable powders are usually compounded to contain 25, 50, 75, or up to 85 percent of toxicarit and usually contain, in addition to solid carrier, 3-10 percent of dispersing agent and, where necessary, 0-10 percent of stabilizer(s) and/or other additives such as penetrants or stickers. Dusts are usually formulated as a dust concentrate having a similar composition to that of a wettable powder but without a dispersant, and are diluted in the field with further solid carrier to give a composition usually containing one-half to 10 percent of toxicant. Granules are usually prepared to have a size between 10 and 10088 mesh, and may be manufactured by agglomeration or impregnation techniques. Generally, granules will contain one-half-25 percent of toxicant plus additives such as stabilizers, slow-release modifiers, binding agents, etc. Emulsifiable concentrates usually contain, in addition to the solvent, and, when necessary, co-solvent, 10-50 percent s/v toxicant, 12-20% w/v emulsifiers and 020% of appropriate additives such as stabilizers, penetrants and corrosion inhibitors. Pastes are compounded soas to obtain a stable flowable product and usually contain 10-60 percent toxicant, 2-20 percent of appropriate additives and, as carrier, water or an organic liquid in which toxicant is substantially insoluble. Except where indicated otherwise, all percentages given in this paragraph are percentages by weight. g

The herbicidal compounds of this invention may be prepared by the reaction of the substituted 2- aminothiazole of formula II:

The substituted aminothiazoles of formula II can be prepared using, as an initial reaction step, the general synthesis technique for thiazoles which was first described by Hantzsch (Ann. 249, l [l888]). This technique which involves the reaction of alphahalocarbonyl compounds with thioureas or thioamides affords a convenient means of obtaining the desired unsubstituted or 4-alkyl substituted 2-aminothiazole intermediate.

The 2-aminothiazole intermediate is then treated with an appropriate halogenating agent to yield a 5- haIo-Z-aminothiazole. This reaction can be successfully carried out in solvents such as water aqueous acids, chloroform, carbon tetrachloride, benzene, carbon disulfide and glacial acetic acid using agents such as iodine, bromine, chlorine or sulfuryl chloride.

The reaction of the halogenated Z-aminothiazole intermediate with a sodium mercaptide will yield the desired 5-thio-2-aminothiazole by replacement of the halogen. This reaction is suitable carried out in refluxing methanol. If an alkylthio compound is desired, the appropriate sodium alkylmercaptide should be used.

This thio compound can be oxidized to the sulfinyl derivative by treatment with meta-chloroperbenzoic acid in chloroform solution. The sulfonyl derivative is prepared similarly using an excess of 33 percent hydrogen peroxide in glacial acetic acid or acetone solution.

5-sulfamoyl derivatives may be prepared by reacting an acylated 2-aminothiazole, optionally substituted in the 4 position with alkyl groups, with excess chlorosulfonic acid and phosphorus pentachloride to yield the 5- chlorosulfonyl intermediate. This 5chlorosulfonyl intermediate is then reacted with the appropriate primary or secondary amine or ammonia to yield the desired 5- sulfamoyl derivative.

The compounds of the invention, processes for their preparation and their herbicidal activity, are illustrated by the following examples, in which parts by weight (w) and parts by volume (v) bear the same relation as the kilogram to the liter and all temperatures are in degrees centigrade.

EXAMPLE I N-(5-(ethylthio)thiazol-2-yl)propionamide 'well with acetone and air dried. This solid (202 w) was suspended in water (800 v) and cooled to 5". Sodium hydroxide (52 w) in water (50 v) containing sodium hydrosulfite (1.0 w) was added dropwise. The mixture was stirred at 5 for 1 hour and filtered to yield 2- amino-S-bromothiazole (188 w) melting at l04-105.

A mixture of 2-amino-5-bromothiazole (45 w), ether (200 v) and ethyl mercaptan (15.5 w) was treated with a solution of sodium methoxide (13.5 w) in absolute methanol (50 v) over a period of 15 minutes. The exothermic reaction raised the temperature to 40 and a fine solid precipitated. The reaction mixture was stirred at ambient temperature for 1 hour and washed with water (3 X 100 v). The organic fraction was dried with MgSO and concentrated by distillation in a vacuum to yield a red solid. This residue was extracted with boiling hexane and the solution was chilled to yield 2- amino-5-(ethylthio)thiazole (25 w) melting at 73-75. The structure was confirmed by infrared spectrum analysis.

To a mixture of 2-amino-5-(ethylthio)thiazole (6 w), tetrahydrofuran (50 v) and triethylamine (3.8 w), propionyl chloride (3.5 w) was added dropwise. The addition produced a precipitate and was exothermic to 45. The reaction mixture was stirred at ambient temperature for 30 minutes and poured into ice water. The solid was collected on a filter and dried to yield N-(5- (ethylthio)thiazole-2-yl)propionamide (7.3 w) m.p. l53l55. The structure was confirmed by elemental and infrared analyses.

ANALYSIS (PERCENT BY WEIGHT) To a solution of N-(5-(ethylthio)thiazol-2- yl)propionamide (4 w) in glacial acetic acid (30 v), 30 percent peroxide (15 v) was added. The reaction mixture, which was exothermic to was cooled with external cooling to 50. The reaction mixture was then left standing at ambient temperatures for 6 hours 'at which time it was poured into ice water and filtered to yield N-(5-(ethylsulfonyl)thiazole-Z-yl)propionamide (3.5 w) m.p. 2l0-213. The structure was confirmed by elemental and infrared spectrum analyses.

ANALYSIS (PERCENT BY WEIGHT) Calculated: Found:

-11 -ll S-25.9

EXAMPLE III N-(4-methyl-S-(methylthio )thiazol-2-yl)propionamide 2-amino-4-methylthiazole (78 w) prepared using the technique described by Hantzsch (Ann. 249, 1 [1888]) was dissolved in concentrated hydrochloric acid (120 v) and bromine (38 v) was added dropwise to the solution over a period of 30 minutes. The temperature of the reaction was controlled at or below 60 during the addition with an ice bath. A colorless solid precipitated during the addition. The reaction mixture was chilled to 4, diluted with 125 v of acetone and filtered. The filter cake was dissolved in a minimum amount of cold water and treated with aqueous ammonia until pH of 8 was obtained. The solid was filtered and dried to yield 2-amino-5-bromo-4-methylthiazole '(55 w) melting at l04l06. The structure was confirmed by infrared spectrum analysis.

A solution of 2-amino-5-bromo-4-methylthiazole (45 w) in absolute methanol (150 v) was stirred during the addition of a solution of sodium methoxide (12.6 w) and methyl mercaptan (11.2 w) in absolute methanol (100 v). After completion of the addition (15 minutes), the reaction mixture was heated to reflux (64) for 2.5 hours, left at ambient temperature for 18 hours, poured over ice, and extracted with methylene chloride (3 X 150 v). The combined extracts were dried with magnesium sulfate and concentrated by distillation in a vacuum to a red solid. The residue was recrystallized from hexane-benzene (3:2) to yield 2-amino-4-methyl- 5-(methylthio)thiazole (23 w) melting at 7780. The structure was confirmed by elemental analysis.

To a mixture of 2-amino-4-methyl-5- (methylthio )thiazole (12.7 w), tetrahydrofuran 100 v) and triethylamine (8,2 w), propionyl chloride (75w) (3 w) m.p. 126-l27. The structure was confirmed by elemental and infrared analyses.

ANALYSIS (PERCENT BY WEIGHT) Calculated: M-l 3.0 S-29.6 Found: Nl2.8' S29.2

EXAMPLE IV N 4-methyl-5-(methylsulfonyl )thiazol-Z-yl )propionamide on. N

l 9 NH( JOH1CI-Ia 0113s 5 .lized from methanol To a solution of N-(4-methyl-5(methylthio)thiazol- 2-yl)propionamide (2 w) in chloroform v), percent rn-chloroperbenzoic acid was added. The solution was chilled during the addition and upon completion of p the addition, the reaction mixture was allowed to stand at ambient temperatures for 18 hours. The'reaction mixture was then washed with an aqueous solution of sodium carbonate (3 w in 15 v), after which the chloroform solution was dried and concentrated by distillation in a vacuum to 2 w of solid residue. The residue was recrystallized from methanol to yield N-(4- methyl-S-(methyl-sulfonyl)thiazol-2-yl)propionamide (1.3 w) m.p. l62-164. The structure was confirmed by elemental and infrared spectrum analyses.

ANALYSIS (PERCENT BY WEIGHT) Calculated: Nl 1.3 8-25 .8 Found: N-l 1.2 S-26.l

EXAMPLE V N.(5-dimethylsulfamoyl)-thiazole-2-yl)propionamide sulfamoyl)-thiazol-2-yl)propioamide (3 w) m.p. 227-230. The structure was confirmed by elemental and infrared spectrum analyses.

ANALYSIS (PERCENT BY WEIGHT) Calculated:

N-l6.0 S-24.3 I Found: N-16.0 S24.6

EXAMPLE VI Following procedures similar to those given in previous examples, the following other species of the compounds of the invention were prepared (symbols refer to formula III).

TABLE I 2 R N o n s R1 S Q N CR:1 n Analysis, percent R4 M p Sulfur N itrognn R3 R R1 R1 11 BC. Citlcrl. Found Calod. Found OH; H 01H; H 0 152-155 31.7 32.0 13.11 13.5 OH; II 0 11 H 2 2194221 22. 4 2s. 9 12. 0 11. 9 H( 1)1 H (31H; H 0 177-119 21. s 27. 6 12. 5 12. 5 armor-1m II. 02115 H 2 234-231 24.4 24.2 10.7 10.5

Cm H H 0 -98 28.0 27.3 12.3 12.1

C111; 11 H 2 21o-213 24. a 24. 9 11. 0

to yield N-(S-(dimethyl EABLE I-Continued Pre-emergence herbicidal activity of the typical compounds of the invention was evaluated by planting 2s weed seeds in soil held in large test tubes, the soil having been treated with the test compound at the rate of 1 and 10 milligrams of test compound per tube, respectively. Seeds of watergrass (Echinochloa crusgalli) and cress (Lepidium sativum) were germinated in treated soil under controlled conditions of temperature and light for 12 to 13 days prior to evaluation of the effectiveness of the treatments. At that time, the germination was noted and the treatments were rated on a 0 Analysis, percent M Sulfur Nitrogen -1. -M p,

R R R I 12 12 0. Caled. Found Calcd. Found on; H (I H 2 265-266 25. 0 w. o 11. 4 11. 1

CH; CH; 3 H 2 220-223 24. 5 24. 2 10. s 10. 5

OH; H H o 26. s 259 11 e 15 5 v LCN 01mm on, 0,115 H 2 155-152 24. 4 24. 2 15. 0 15. 3 NE: B 01115 H 2 235-241 21. 2 2s. 5 11. 2 11. 4 01mm CH2 0211 H 2 114-111 23. 1 22.8 15. 2 15. gGHmN H 01115 H 2 221-230 24.3 24. 5 16.0 15.0

H, CH; 0,11, CH3 0 10-13 21. s 21. 5 12. 2 12. 5 CH CH5 01H; CH; 2 159-162 24.4 24.1 10.1 10.8

EXAMPLE VII (no effect) to 9 (all dead) scale. The results are summarized in Table II.

Post-emergence herbicidal activity was evaluated by spraying dilute suspensions of the test compound in a 1:1 of mixture of acetone and water with 0.5 percent wetting agent or crabgrass (Digitaria sanguina lis) and pigweed plants (Amaranthus sp) grown under controlled conditions at the rates of l and 10 pounds per acre. After the plants were held for 10 to ll days, they were rated for treatment effect on a 0 (no effect) to 9 (total plant kill) scale. The results of these tests are shown in Table I].

TABLE II I 0 R -5( 0 J- g- R Pre-emergence Post-emergence H 4 Watergrass Cress Crabgrass Pigweed R R R R 771 10 l 10 1 19 l 10 CH3 E 02115 H 0 8 9 8 9 7 9 9 9 CH: H 01115 H 2 7 8 9 9 1 9 7 9 3 CH2 2H5 H 0 6 8 9 9 9 9 7 9 CH3 CH3 CzHs H 2 8 8 9 9 6 9 7 9 CIHs H C2H5 H 0 8 8 8 8 3 9 9 9 CzHs H CzHs H 2 8 8 9 9 9 9 9 9 (CHI)2CH H CRHS H 0 1 7 S 8 8 9 8 9 (CH-zlzCH H CzHs H 2 8 8 9 9 G 8 9 9 OH! H CHfCHG)! H 0 4 9 8 9 6 9 G 9 CH3 H CH(CH3)2 H 2 7 8 9 9 0 5 7 9 OH; H H 0 7 9 9 9 7 9 6 9 CH5 CH1 H 0 3 8 8 9 8 9 9 9 CH3 H H 1 7 9 9 9 7 9 9 9 CH3 H H 2 8 8 9 9 9 9 7 9 CH5 CH3 H 2 7 8 9 9 7 9 9 9 CH3 H H 0 1 7 B 9 4 7 1 7 OH: H f H 0 2 8 6 8 8 9 3 9 Ha I CH2 H H 2 6 8 8 9 6 8 1 9 Table i R --'N M f I I e ,2 r..s H 7.7 Ham, R 5. 0/ N. R Pre-emergence Post-emergence B z4 Watergrass Cress Crabgrass Plgweed R R R R 7b 1 10 1 10 1 10 1 1O 0 H; 11 :l H 0 4 's'" 8 "9 s 9 e 9 CH(CH;): H :l H 0 5 7 8 8 9 9 9 9 CH(CH;): H H 2 8 8 8 9 9 9 9 9 H C(CHa); H 0 8 9 7 9 7 9 9 9 OH; H C(CH3)3 H 2 0 6 7 8 0 0 4 9 H 0 5 7 7 9 8 9 9 9 CH; H

eig i" i Ti" 5 1i"'-" s s 9'TT) "2 9 CH; H CH3 H 0 6 7 8 8 6 9 9 9 HC H1 v 01H; H (IIHa H 0 2 6 7 8 8 9 9 9 CHC H CH(CH:): H CH; H 0 0 0 5 6 7 8 6 9 HC3H1 OH; H OH; H 2 8 8 9 9 9 9 9 9 JHO H 01H; H CH; H 2 7 8 9 9 9 9 7 9 HC3H1 CH(CH;)1 H OH; H 2 2 a s 0 a 6 5 9 AIHC;H

CH3 CH3 CH3 0 0 3 8 8 2 8 8 9 CH; CH: CH3 2 3 7 9 9 2 6 4 9 01mm H 02H; H 2 s s' '9' '9 a a 9 9 CHahN CH; 02H; H ,2 8 8 9 9 0 7 0 9 HINH CH: C2 5 H 2 6 8 8 9 3 6 6 9 01H; CH; q H 2 7 8 8 9 7 9 4 9 CH CH3 02115 H 0 6 8 9 9 8 9 9 9 WE CLAIM AS OUR INVENTION: 1. A compound of the formula wherein R represents hydrogen or alkyl of up to four carbon atoms, R is alkyl of 2 to 8 carbon atoms, cyclic alkyl of three to eight carbon atoms optionally substituted by phenyl or cyano, or alkenyl of two to eight 50 wherein R and R is each hydrogen or alkyl of one to four carbon atoms.

2. Compounds according to claim 1, wherein R represents hydrogen or methyl, R is alkyl of two to five of up to 4 carbon atoms, IS alkyl of up to three carcarbon atoms optionally containing up to two trifluoromethyl groups; n is 0, l or 2; R is hydrogen or alkyl of up to 4 carbon atoms, R is alkyl of one to four carbon atoms or carbon 3 R is by toms or cyclic al rogen or methyl,

bon atoms or lgal 2 3 3 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3:7 7: 5 Dated February 20, 1973 Invent r(s) H. and. D.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In Table I, columns 7, 8 and 9, the formula.

\\ 2 ..s(0) i. N -3 should read R S(O) C R S R S In Table II, columns ll, 12 and 13, the formula \1 i/ I, R? I? N o R r 0 i I 3 I 1 R S(0) 1I C- R should read R S(o)n S C- R RE R Signedand sealed this 10th day of September 1974.

(SEAL) Attest:

MCCOY M. GIBSON, JR. C. MARSHALL DANN Attesting Officer I Commissioner of Patents 

1. a compound of the formula
 2. Compounds according to claim 1, wherein R represents hydrogen or methyl, R1 is alkyl of two to five carbon atoms or cyclic alkyl of up to 4 carbon atoms, R2 is hydrogen or methyl, R3 is alkyl of up to three carbon atoms or wherein R4 and R5 represent hydrogen or alkyl of up to three carbon atoms, n is 0, 1 or
 2. 